PDF schematic for the Wistron Raichu WL / Pikachu WL project, board 18730-1M, about 5.2 MB. Wistron names its projects with code names like these, and many of its boards go into Dell laptops, though the name does not state the end model. The document covers power rails, signal paths and component references for diagnosing faults such as no power or no charging. It pairs with the 18730-1M boardview. Verify the board number printed on the PCB first.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cynetitsolution. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)